CN112309334A - Pixel driving circuit and method, display device - Google Patents

Abstract

The present disclosure relates to a pixel driving circuit and method, and a display device, so as to solve the problem of screen splashing caused by leakage current. The pixel driving circuit includes: a first switch unit for adjusting the voltage of the first node according to the voltage of the reference voltage terminal; a second switch unit for turning on the driving reading unit according to the voltage of the first node; driving the reading unit , for adjusting the voltage of the second node according to the signal of the data line terminal, and generating the driving current according to the voltage of the second node and the voltage of the first voltage terminal, and outputting the driving current to the light-emitting control unit; the first storage unit, one end of which is connected to The second voltage terminal, the other terminal is connected to the first node, and is used for storing the voltage of the first node; the second storage unit, one end of which is connected to the first voltage terminal, and the other terminal is connected to the second node, and is used to store the voltage of the second node; The light-emitting control unit is used for controlling the electroluminescent element to emit light according to the signal of the second signal terminal and the driving current.

Description

Pixel drive circuit and method, display device

technical field

The present disclosure relates to the field of display technology, and in particular, to a pixel driving circuit and method, and a display device.

Background technique

AMOLED (Active Matrix OLED, Active Matrix OLED) has pixels arranged in an array, which is an active display type, and its luminous efficacy is high. It is usually used as a high-definition large-size display device. Therefore, AMOLED is used more and more. widely.

Since AMOLED is a current-driven device, the brightness of light emission is determined by the current flowing through the OLED itself. Most of the existing chip circuits can only transmit voltage signals, so a pixel driving circuit needs to be used to convert the voltage signal into a current signal.

In the existing AMOLED display panel, each light-emitting pixel has a pixel driving circuit to provide it with a driving current. However, due to the large leakage current of the existing pixel driving circuit, the leakage current is relatively large, which leads to problems such as screen splashes (such as head-up lines) on the display panel, and at the same time, the circuit power consumption of the display panel is also increased to a certain extent. .

SUMMARY OF THE INVENTION

To overcome the problems in the related art, the present disclosure provides a pixel driving circuit and method, and a display device.

In order to achieve the above object, the present disclosure provides a pixel driving circuit, comprising: a first switch unit, a second switch unit, a drive reading unit, a light emission control unit, a first storage unit, and a second storage unit;

the first switch unit, configured to adjust the voltage of the first node according to the voltage of the reference voltage terminal;

the second switch unit, configured to turn on the drive reading unit according to the voltage of the first node;

The driving reading unit is configured to adjust the voltage of the second node according to the signal of the data line terminal, generate a driving current according to the voltage of the second node and the voltage of the first voltage terminal, and output the driving current to the Lighting control unit;

the first storage unit, one end of which is connected to the second voltage end, and the other end of which is connected to the first node, for storing the voltage of the first node;

the second storage unit, one end of which is connected to the first voltage end and the other end is connected to the second node, for storing the voltage of the second node;

The light-emitting control unit is configured to control the electroluminescent element to emit light according to the signal of the second signal terminal and the driving current.

Optionally, the first switch unit includes:

The gate of the first transistor is connected to the third signal terminal, the first electrode is connected to the reference voltage terminal, and the second electrode is connected to the first node.

Optionally, the second switch unit includes:

a second transistor, the gate of which is connected to the fourth signal terminal, the first electrode is connected to the first node, and the second electrode is connected to the second node;

The gate of the third transistor is connected to the first signal terminal, the first electrode is connected to the second node, and the second electrode is connected to the light-emitting control unit.

Optionally, the drive reading unit includes:

a fourth transistor, the gate of which is connected to the second node, the first electrode is connected to the third node, and the second electrode is connected to the light-emitting control unit;

a fifth transistor, the gate of which is connected to the second signal terminal, the first electrode is connected to the first voltage terminal, and the second electrode is connected to the third node;

The sixth transistor has a gate connected to the first signal terminal, a first electrode connected to the third node, and a second electrode connected to the data line terminal.

Optionally, the lighting control unit includes:

a seventh transistor, the gate of which is connected to the second signal terminal, and the first electrode of which is connected to the fourth transistor

The second pole is connected to the electroluminescent element.

Optionally, the first transistor is an N-type transistor, and the second transistor to the seventh transistor are all P-type transistors; or,

The first transistor is a P-type transistor, and the second to seventh transistors are all N-type transistors.

Optionally, the first storage unit includes:

The first capacitor has a first pole connected to the first node, and a second pole connected to the second voltage terminal.

Optionally, the second storage unit includes:

The second capacitor has a first pole connected to the second node, and a second pole connected to the first voltage terminal.

The present disclosure also provides a display device including the pixel driving circuit provided by the embodiments of the present disclosure.

The present disclosure also provides a control method for a pixel driving circuit, the pixel driving method is applied to the pixel driving circuit provided by the present disclosure, and the method includes:

In the first reset stage, the first switch unit writes the voltage of the reference voltage terminal into the first node;

In the second reset stage, the second switch unit writes the voltage of the first node into the second node to turn on the drive read unit;

In the data writing stage, the driving and reading unit adjusts the voltage of the second node according to the signal at the end of the data line;

In the light-emitting phase, the driving and reading unit generates a driving current according to the voltage of the second node and the voltage of the first voltage terminal, and outputs the driving current to the light-emitting control unit, which is based on The signal at the second signal terminal and the driving current control the electroluminescent element to emit light.

Optionally, the pixel driving circuit is the pixel driving circuit of claim 5, and the method includes:

in the first reset stage, inputting a shutdown signal to the first signal terminal, the second signal terminal and the fourth signal terminal, and inputting a turn-on signal to the third signal terminal;

in the second reset stage, inputting a turn-off signal to the first signal terminal, the second signal terminal and the third signal terminal, and inputting a turn-on signal to the fourth signal terminal;

In the data writing stage, a turn-on signal is input to the first signal terminal, and a turn-off signal is input to the second signal terminal, the third signal terminal and the fourth signal terminal;

In the light-emitting phase, an off signal is input to the first signal terminal, the third signal terminal and the fourth signal terminal, and an on signal is input to the second signal terminal.

Through the above technical solution, at least the following technical effects can be achieved: compared with the pixel driving circuit in the related art, the pixel driving circuit provided by this embodiment adds a switch unit, which is equivalent to increasing the impedance in the circuit and can reduce the light-emitting stage The driving current is lost in the leakage current of the switching element, which can improve the effect of screen flicker caused by the leakage current, and increase the driving current flowing through the electroluminescent element, thereby improving the screen display efficiency and reducing the screen display power consumption.

Other features and advantages of the present disclosure will be described in detail in the detailed description that follows.

Description of drawings

The accompanying drawings are used to provide a further understanding of the present disclosure, and constitute a part of the specification, and together with the following detailed description, are used to explain the present disclosure, but not to limit the present disclosure. In the attached image:

FIG. 1 is a schematic structural diagram of a pixel driving circuit shown in an exemplary embodiment of the prior art;

FIG. 2 is a schematic structural diagram of a pixel driving circuit according to an exemplary embodiment of the present disclosure;

FIG. 3 is an input control timing diagram of a pixel driving circuit according to an exemplary embodiment of the present disclosure;

FIG. 4 is a flowchart of a pixel driving method according to an exemplary embodiment of the present disclosure.

Detailed ways

Exemplary embodiments will be described in detail herein, examples of which are illustrated in the accompanying drawings. When the following description refers to the drawings, the same numerals in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the illustrative examples below are not intended to represent all implementations consistent with this disclosure. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present disclosure as recited in the appended claims.

In the present disclosure, the terms "first", "second" and the like in the description and claims of the present disclosure and the drawings are used to distinguish similar objects, and are not necessarily construed as a specific order or sequence.

In order to make it easier for those skilled in the art to understand the improvements of the embodiments of the present disclosure to the prior art, firstly, the related technical solutions in the prior art are briefly introduced.

As shown in FIG. 1, a pixel driving circuit in the prior art includes transistors T1 to T4. During the operation of the pixel driving circuit, in the reset stage, when the control terminal of the transistor T1 receives a low-level reset signal RESET, The transistor T1 is turned on, and the reference voltage V _init is written to the control terminal of the driving transistor T3 . At this time, the transistor T3 is turned on. In the data writing phase, when the control terminal of the transistor T2 receives a low level data writing control signal GATE, the transistor T2 is turned on. In the light-emitting stage, when the control terminal of the transistor T4 receives the low-level light-emitting control signal EM, the transistor T4 is turned on, and the driving current generated by the driving transistor T3 can flow through the electroluminescent element to drive the electroluminescent element to work. .

However, since the transistor T1 is actually in a high-impedance state when it is turned off, the driving current generated by the driving transistor T3 is also shunted to the transistor T1, and a leakage current is formed between the drain and the source of the transistor T1. Due to the existence of the leakage current, the working state of the light-emitting element will be affected, causing problems such as screen flickering on the display panel, and the static power consumption of the entire circuit will increase, that is, the power consumption of the display panel will be increased.

In order to solve the above-mentioned problems in the related art, the present disclosure provides a pixel driving circuit. FIG. 2 is a schematic structural diagram of a pixel driving circuit according to an exemplary embodiment of the present disclosure. As shown in FIG. 2 , the circuit includes a first switch unit 110 , a second switch unit 120 , a drive reading unit 130 , a light-emitting unit The control unit 140 , the first storage unit 150 and the second storage unit 160 .

The first switch unit 110 is configured to adjust the voltage of the first node NODE1 according to the voltage of the reference voltage terminal INIT.

The second switch unit 120 is configured to turn on and drive the reading unit 130 according to the voltage of the first node NODE1.

The driving reading unit 130 is adapted to adjust the voltage of the second node NODE2 according to the signal of the data line terminal DATA, and generate a driving current according to the voltage of the second node NODE2 and the voltage of the first voltage terminal ELVDD, and output the driving current to Lighting control unit 140 .

The light emission control unit 140 is configured to control the electroluminescence element 200 to emit light according to the signal of the second signal terminal EM and the driving current.

Compared with the pixel driving circuit in the related art, the pixel driving circuit provided by this embodiment adds a switching unit, which is equivalent to increasing the impedance in the circuit, which can reduce the leakage current of the switching element due to the loss of the driving current in the light-emitting phase, and thus can reduce the leakage current of the switching element. The effect of screen splash caused by leakage current is improved, and the driving current flowing through the electroluminescent element is increased, thereby improving the screen display efficiency and reducing the screen display power consumption.

Specifically, the first switching unit 110 includes a first transistor T1. The gate of the first transistor T1 is connected to the third signal terminal RESET1, the first electrode is connected to the reference voltage terminal INIT, and the second electrode is connected to the first node NODE1.

The second switching unit 120 includes a second transistor T2 and a third transistor T3. The gate of the second transistor T2 is connected to the fourth signal terminal RESET2, the first electrode is connected to the first node NODE1, and the second electrode is connected to the second node NODE2. The gate of the third transistor T3 is connected to the first signal terminal GATE, the first electrode is connected to the second node NODE2 , and the second electrode is connected to the light-emitting control unit 140 .

The driving reading unit 130 includes a fourth transistor T4, a fifth transistor T5 and a sixth transistor T6. The gate of the fourth transistor T4 is connected to the second node NODE2 , the first electrode is connected to the third node NODE3 , and the second electrode is connected to the light-emitting control unit 140 . The gate of the fifth transistor T5 is connected to the second signal terminal EM, the first electrode is connected to the first voltage terminal ELVDD, and the second electrode is connected to the light emitting control unit 140 . The gate of the sixth transistor T6 is connected to the first signal terminal GATE, the first electrode is connected to the third node NODE3, and the second electrode is connected to the data line DATA.

The light emission control unit 140 includes a seventh transistor T7. The gate of the seventh transistor T7 is connected to the second signal terminal EM, the first electrode is connected to the second electrode of the fourth transistor T4 , and the second electrode is connected to the electroluminescent element 200 .

The first storage unit 150 includes a first capacitor C1. The first electrode of the first capacitor C1 is connected to the first node NODE1, and the second electrode is connected to the second voltage terminal ELVSS.

The second storage unit 160 includes a second capacitor C2. The first electrode of the second capacitor C2 is connected to the second node NODE2, and the second electrode is connected to the first voltage terminal ELVDD.

In order to make it easier for those skilled in the art to understand the pixel driving circuit provided by the embodiments of the present disclosure, in the following in conjunction with the signal timing diagram of each signal terminal shown in FIG. 3 , the first transistor T1 is an N-type transistor, and the second transistors T2 to seventh Taking the transistor T7 as a P-type transistor as an example, the working principle of the pixel driving circuit described in the above embodiments will be described.

(1) Reset stage

In the embodiment of the present disclosure, the reset phase includes a first reset phase t1 and a second reset phase t2.

In the first reset phase t1, a turn-off signal is input to the first signal terminal GATE, the second signal terminal EM and the fourth signal terminal RESET2, and a turn-on signal is input to the third signal terminal RESET1, for example, to the first signal terminal GATE to The fourth signal terminal RESET2 is input with a high level signal. At this time, the first transistor T1 is turned on, the second transistor T2 to the seventh transistor T7 are all turned off, and the voltage of the reference voltage terminal Vinit is written into the first transistor T1 through the first transistor T1. At the node NODE1, the first capacitor C1 stores the voltage of the first first node NODE1 (ie, Vinit).

In the second reset phase t2, an off signal is input to the first signal terminal GATE, the second signal terminal EM and the third signal terminal RESET1, and a turn-on signal is input to the fourth signal terminal RESET2, for example, to the first signal terminal GATE and the second signal terminal EM input a high-level signal and input a low-level signal to the third signal terminal RESET1 and the fourth signal terminal RESET2, at this time, the first transistor T1, the third transistor T3 and the fourth transistor T4 are turned off, The second transistor T2 is turned on, and the reference voltage Vinit stored in the first capacitor C1 is written to the second node NODE2 through the second transistor T2. At the same time, since the voltage of the second node NODE2 is the reference voltage Vinit, the fourth transistor T4 is turned on Pass.

(2) Data writing stage t3

In this stage, a turn-on signal is written to the first signal terminal GATE, and a turn-off signal is written to the second signal terminal EM, the third signal terminal RESET1 and the fourth signal terminal RESET2, for example, to the first signal terminal EM and the fourth signal terminal RESET2. The third signal terminal RESET1 inputs a low-level signal and inputs a high-level signal to the second signal terminal GATE and the fourth signal terminal RESET2. At this time, the first transistor T1, the second transistor T2, the fifth transistor T5 and the seventh transistor T7 is turned off, the third transistor T3, the fourth transistor T4 and the sixth transistor T6 are turned on, and the signal V _DATA of the data line terminal DATA is written into the second node NODE2 through the sixth transistor T6 and the fourth transistor T4. The second capacitor C2 stores the voltage of the second node NODE2 (ie V _DATA ).

(3) Lighting stage t4

At this stage, a turn-off signal is written to the first signal terminal GATE, the third signal terminal RESET1 and the fourth signal terminal RESET2, and a turn-on signal is input to the second signal terminal EM, such as the first signal terminal GATE and the fourth signal terminal. The terminal RESET2 inputs a high level signal and inputs a low level signal to the second signal terminal EM and the third signal terminal RESET1, at this time, the first transistor T1, the second transistor T2, the third transistor T3 and the sixth transistor T6 are turned off , the fourth transistor T4 and the seventh transistor T7 are turned on, the voltage V _DATA of the second node NODE2 and the voltage V _ELVDD of the first voltage terminal ELVDD stored in the second capacitor C2 output the driving current through the fourth transistor T4, the driving current It flows to the seventh transistor T7 and is output to the electroluminescence element 200 to drive the electroluminescence element 200 to emit light.

It is worth noting that, since the second transistor T2 to the seventh transistor T7 are P-type transistors as an example, because the threshold voltage Vth of the fourth transistor T4 exists, after the data writing phase ends, the voltage of the second node NODE2 is actually is _VDATA +Vth.

Further, in the light-emitting stage, the driving current I output by the fourth transistor T4 is:

Wherein, K is a constant, V _gs is the voltage difference between the gate and the source of the fourth transistor T4, V _gs =(V _DATA +V _th )-V _ELVDD , that is, the second node NODE2 and the fourth transistor The voltage difference between the second poles of T4.

Since the driving current I is only related to the signal V _DATA input from the data line terminal DATA and the voltage V _ELVDD of the first voltage terminal, the influence of the threshold voltage V _th can be eliminated, that is, the threshold voltage V _th is first stored in the fourth transistor T4 Within the gate-source voltage V _gs , in the light-emitting stage, V _gs -V _th is converted into the driving current, because the gate-source voltage V _gs of the fourth transistor T4 already contains the threshold voltage V _th , when the driving current is converted, it can be The influence of the threshold voltage V _th is canceled, thereby achieving the consistency of the current, making the DC voltage affecting the light-emitting brightness of the electroluminescent unit 200 more stable, and avoiding the threshold voltage V _th when the same signal V _DATA is input to the data line terminal DATA. Different currents are generated due to the offset, resulting in the problem of uneven brightness.

In addition, in the specific implementation, the pixel driving circuit will enter the reset phase of the next frame when the light-emitting phase of one frame of the line scanning period ends. In each frame time, only the signal input to the data line DATA needs to be changed. The magnitude of V _DATA can change the driving current output by the fourth transistor T4, thereby driving the electroluminescent element 200 to display different contents.

It is also worth mentioning that the first voltage terminal ELVDD is used for providing the working voltage V _ELVDD , the second voltage terminal ELVSS is used for providing the slave voltage V _ELVSS , and the reference voltage terminal INIT is used for providing the reference voltage Vinit.

Secondly, the first transistor T1 may be an N-type transistor, and correspondingly, the second transistor T2 to the seventh transistor T7 are P-type transistors (as shown in FIG. 2 ); or, the first transistor T1 may be a P-type transistor, correspondingly Ground, the second transistor T2 to the seventh transistor T7 are N-type transistors.

In addition, the electroluminescent element 200 in the above-mentioned embodiment may be an LED (Light Emitting Diode, light-emitting diode), or an OLED (Organic Light Emitting Diode, organic light-emitting diode), or other current-driven light-emitting devices, which are not covered by the present disclosure. Do limit.

Based on the same inventive concept, the present disclosure further provides a display device including the pixel driving circuit described in any of the above embodiments. Specifically, the display device may be an organic light emitting diode (OLED) display panel, electronic paper, mobile phone, tablet computer, TV, personal digital assistant (PDA) and other products or components with display function.

Based on the same inventive concept, the present disclosure further provides a pixel driving method, which is applied to the pixel driving circuit described in any of the above embodiments. FIG. 4 is a flowchart of a pixel driving method according to an exemplary embodiment of the present disclosure. As shown in FIG. 4 , the method includes the following steps:

S41. In the first reset stage, the first switch unit 110 writes the voltage of the reference voltage terminal INIT into the first node NODE1.

S42. In the second reset stage, the second switching unit 120 writes the voltage of the first node NODE1 into the second node NODE2 to turn on the driving and reading unit 130.

S43. In the data writing stage, the driving and reading unit 130 adjusts the voltage of the second node NODE2 according to the signal of the data line terminal DATA.

S44. In the light-emitting stage, the driving and reading unit 130 generates a driving current according to the voltage of the second node NODE2 and the voltage of the first voltage terminal ELVDD, and outputs the driving current to the light-emitting control unit 140, and the light-emitting control unit 140 according to the second The signal at the signal terminal EM and the driving current control the electroluminescent element 200 to emit light.

Specifically, in this method, the first voltage terminal ELVDD is used to provide the working voltage V _ELVDD , the second voltage terminal ELVSS is used to provide the slave voltage V _ELVSS , and the reference voltage terminal INIT is used to provide the reference voltage Vinit. Specifically, the method includes:

In the first reset stage, the turn-off signal is input to the first signal terminal GATE, the second signal terminal EM and the fourth signal terminal RESET2, and the turn-on signal is input to the third signal terminal RESET1;

In the second reset stage, the turn-off signal is input to the first signal terminal GATE, the second signal terminal EM and the third signal terminal RESET1, and the turn-on signal is input to the fourth signal terminal RESET2;

In the data writing stage, a turn-on signal is input to the first signal terminal GATE, and a turn-off signal is input to the second signal terminal EM, the third signal terminal RESET1 and the fourth signal terminal RESET2;

In the light-emitting stage, a turn-off signal is input to the first signal terminal GATE, the third signal terminal RESET1 and the fourth signal terminal RESET2, and a turn-on signal is input to the second signal terminal EM.

It should be noted that, with regard to the pixel driving method in the embodiments of the present disclosure, the execution steps therein have been described in detail in the embodiments of the pixel driving circuit, and will not be described in detail here.

It is worth noting that, with regard to the control method of the pixel driving circuit in the embodiment of the present disclosure, the execution steps therein have been described in detail in the embodiment of the pixel driving circuit, and will not be described in detail here.

The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings. However, the present disclosure is not limited to the specific details of the above-mentioned embodiments. Within the scope of the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure. These simple modifications all fall within the protection scope of the present disclosure.

In addition, it should be noted that each specific technical feature described in the above-mentioned specific implementation manner may be combined in any suitable manner under the circumstance that there is no contradiction. In order to avoid unnecessary repetition, various possible combinations are not described in the present disclosure.

In addition, the various embodiments of the present disclosure can also be arbitrarily combined, as long as they do not violate the spirit of the present disclosure, they should also be regarded as the contents disclosed in the present disclosure.

Claims (11)

1. A pixel driving circuit, comprising: a first switch unit, a second switch unit, a drive reading unit, a light emission control unit, a first storage unit and a second storage unit; the first switch unit, configured to adjust the voltage of the first node according to the voltage of the reference voltage terminal; the second switch unit, configured to turn on the drive reading unit according to the voltage of the first node; The driving reading unit is configured to adjust the voltage of the second node according to the signal of the data line terminal, generate a driving current according to the voltage of the second node and the voltage of the first voltage terminal, and output the driving current to the Lighting control unit; the first storage unit, one end of which is connected to the second voltage end, and the other end of which is connected to the first node, for storing the voltage of the first node; the second storage unit, one end of which is connected to the first voltage end and the other end is connected to the second node, for storing the voltage of the second node; The light-emitting control unit is configured to control the electroluminescent element to emit light according to the signal of the second signal terminal and the driving current. 2. The circuit of claim 1, wherein the first switch unit comprises: The gate of the first transistor is connected to the third signal terminal, the first electrode is connected to the reference voltage terminal, and the second electrode is connected to the first node. 3. The circuit of claim 2, wherein the second switch unit comprises: a second transistor, the gate of which is connected to the fourth signal terminal, the first electrode is connected to the first node, and the second electrode is connected to the second node; The gate of the third transistor is connected to the first signal terminal, the first electrode is connected to the second node, and the second electrode is connected to the light-emitting control unit. 4. The circuit according to claim 3, wherein the drive reading unit comprises: a fourth transistor, the gate of which is connected to the second node, the first electrode is connected to the third node, and the second electrode is connected to the light-emitting control unit; a fifth transistor, the gate of which is connected to the second signal terminal, the first electrode is connected to the first voltage terminal, and the second electrode is connected to the third node; The sixth transistor has a gate connected to the first signal terminal, a first electrode connected to the third node, and a second electrode connected to the data line terminal. 5. The circuit of claim 4, wherein the lighting control unit comprises: The gate of the seventh transistor is connected to the second signal terminal, the first electrode is connected to the second electrode of the fourth transistor, and the second electrode is connected to the electroluminescent element. 6. The circuit according to claim 5, wherein the first transistor is an N-type transistor, and the second transistor to the seventh transistor are all P-type transistors; or, The first transistor is a P-type transistor, and the second to seventh transistors are all N-type transistors. 7. The circuit according to any one of claims 1 to 6, wherein the first storage unit comprises: The first capacitor has a first pole connected to the first node, and a second pole connected to the second voltage terminal. 8. The circuit according to any one of claims 1 to 6, wherein the second storage unit comprises: The second capacitor has a first pole connected to the second node, and a second pole connected to the first voltage terminal. 9 . A display device, comprising the pixel driving circuit according to claim 1 . 10 . 10. A pixel driving method, wherein the pixel driving method is applied to the pixel driving circuit according to any one of claims 1 to 8, the method comprising: In the first reset stage, the first switch unit writes the voltage of the reference voltage terminal into the first node; In the second reset stage, the second switch unit writes the voltage of the first node into the second node to turn on the drive read unit; In the data writing stage, the driving and reading unit adjusts the voltage of the second node according to the signal at the end of the data line; In the light-emitting stage, the driving and reading unit generates a driving current according to the voltage of the second node and the voltage of the first voltage terminal, and outputs the driving current to the light-emitting control unit, which is based on The signal at the second signal terminal and the driving current control the electroluminescent element to emit light. 11. The method according to claim 10, wherein the pixel driving circuit is the pixel driving circuit according to claim 5, and the method comprises: in the first reset stage, inputting a shutdown signal to the first signal terminal, the second signal terminal and the fourth signal terminal, and inputting a turn-on signal to the third signal terminal; in the second reset stage, inputting a turn-off signal to the first signal terminal, the second signal terminal and the third signal terminal, and inputting a turn-on signal to the fourth signal terminal; In the data writing stage, a turn-on signal is input to the first signal terminal, and a turn-off signal is input to the second signal terminal, the third signal terminal and the fourth signal terminal; In the light-emitting phase, an off signal is input to the first signal terminal, the third signal terminal and the fourth signal terminal, and an on signal is input to the second signal terminal.

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